Compressed-air brake.



Nb'. 871,509. PUBMED Nov.A 19, 19o?.

F. JORDAN.

coMPRBssED AIR BRAKE. APPLICATION FILED MAB 30, 1907 vn: Nunn! xrrns co., tvAsulNcfoN, l. c.

UNITED sTATEs PATENT oEEroE.

-FRANZ JORDAN, OF KTI'IEN, GERMANY.

COMPRESSED-AIR BRAKE.

To all 'whom 'it may concern.'

Be it known that I, FRANZ J oRDAN, residing at Kthen, in the Duchy of Anhalt and German Empire, have invented new and useful Improvements in Oompressed-Air Brakes, of which the following is a specification.

'The subject of my invention isy a compressed air brake for lifting apparatus, wherebythe rate of descent may be .kept unifor'm for all loads.

The compressed air brakes hitherto employed for hoisting apparatus all have the defeet that their regulation is extremely dillicult and if they are operated from a distance is, in fact,.altogether impossible. They can, therefore, only be employed as stopping brake, but not for insuring uniform descent of the loads through considerable distances.

, the disk e uch compressed air braking apparatus, therefore, only admits of limited use and other brakes though neither so safe -in their' action, nor so economical in use, nor so simle in construction and operation, cannot be ispensed with.

My present invention consists in combine ing the compressed air brake disclosed in German Patent Nr.,138045 with an electrically actuated valve and with a centrifugal weight governor,- whereby I am enabled to insure uniform rate of descent for all loads. 'Ifhe compressed air necessary for working (t. e. applying or slacking) the brake, is obtained according tothe patent cited by means ofl a compressor positively coupled with the lifting apparatus. The load thus produces automatically and in the simplest manner, free of cost, the compressed air requisite for braking.`

One form of construction of such a braking apparatus is illustrated in theaccompanying drawing, in which Figure l is a general View in elevation and part section Fig. 2 a horizontal section through ther compressor, with centrifugal weight governor; Fig. 3 a vertical section through'the governor; Fig. 4 a vertical section through the brake cylinder; Fig. 5 a verticaly section through the electromagnetic valve. l, y'

a is a compressor, provided with a centrifugal weight governor b. 4The compressor' is connected by 'a p ipe e with a brake cylinder' d whichis permanen-tly connected with, that is, acts upon, Va brake disk e. The braking device in the example shown, is applied to bythe Weighted lever In, carried by Specification of Letters Patent.

Application tiled March 30.1907. Serial No. 365.494.

l l l Patented Nov. 19, 19o?.

the piston-rod. of the brake cylinder' (Z. Compressed air, coming from the compressor' a, will lift said rod and release the brake, and the brake will be tightened or applied in the same degree, as the pressure in the cylinder d is lowered. The admission and outlet of the air and the amount of pressure in the brake cylinder is controlled by an electrically actuated valve f, which is thrown into and out of operation by a handswitch- (not shown in the drawing) andvby the centrihrgal weight governor' b rotating with the compressor or the lifting apparatus. The governor' l; is adjusted by means of a spring for a definite number' of revolutions or Depending upon whether its speed of rotation is higher or lower' than the same, it inu terrupts or closes the vcircuit of the electromagnetic valve f th us causing the compressed air brake to be alternately tightened or slacked.

In view of the high degree of scnsitiveness of the centrifugal weight governor' and of the electromagnet f; whose induction current causes no serions difficulties owing to the gradual opening of the contacts in the centrifugal wei'ht governor; in view of the high degree of eIasticity and rate of exit of the compressed air; and in view of the heavy rotating masses of the lifting gear; the-regulation of the descent of with such precision that the loads can be lowered at almost uniform rate and without the occurrence of shocks. g is an air reservoir connected with the compressor a, and iitted with a safety valve h and a discharge cock In 'the pipe connecting the compressor (t with the air reservoir g there is a stop cock 7c and a pressure-gage l.

The purpose ol" the rapid automatic release ing work or taking it up after when there is no compressed-air in the air reservoir. When the said reservoir g has been :filled up with compressed air under' a predetermined pressure to be ascertained by the gage Z, the valve fr is closed and the compressed air kept`stored in the reservoir g for use, t'. e. for compensating the lacking pressure of the compressor a, on starting work or taking it up after a long pause. pressed air in the reservoir g, in such a case, will be supplied to the der control of the valve f, until the conipressor rt will be in operation to supply the required pressure. There is thus no danger' rate descent.

valve is to enable,

tlieiload is effected The conrr brake cylinder d, un-

25 The centrifugal Weight governor at the same of overloading of the hoisting motor, even in the event of its Working with maximum load and applied brake.

In order to keep the interior parts of the brake device clearrom dust and dirt, the compressor draw-s in the air through a suction device m, or takes it -from a filter or from a tightly closed reservoir-into which the dust- Jfree air escaping from the brake cylinder is conducted. v

The law according to which the descending movement proceeds may be expressed mathematically. Y libeing the load on the hook, and R the frictional resistance of the lifting gear, Bx the braking power, varying between zero and' its maximum value, and M the masses moved, all referred to the hook, do dt crease in time dt.

According to the principle of mechanics, force=rnass acceleration, the equation of time offers the advantage that overstepping of the normal rate of descent is rendered impossible. The retarding and stopping of the loads is effected by simply generator circuit In place of the valve shown, a slide valve of air any other fluid might be made use of.

Vhat l do claim as my invention and desire to secure by Letters Patent, is :A-'

ln electrically driven lifting apparatus, in combination, a braking device, a brake cylinder therefor, an electromagnetically actuated valve regulating the supply of a pressure vagent to the brake cylinder, and a centrifugal Weight governor controlling the electric circuit of saidvalve, substantially as and for E 1 v v the purposes described. =ratio o ve ocity of hook-decrease or 1n- 1n testimony whereof I have Signed my name to this specification in the presence of two subscribing Witnesses.

FRANZ JORDAN Witnesses:

RUDOLF LANDGRAT, LUDWIG WEmicH.

-motion is then: g2:

interrupting thel by means of a hand-switch.`

might equally Well be employed; and instead 

